Miller (Modern Electronics Communications

8/12/2019 Miller (Modern Electronics Communications

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Miller 7th Ed. Reviewer

Chapter 1. Introductory Topics

1. Which part of the sinewave expression cannot be varied in accordance with the low-frequency intelligence to create a modulatedsignal?

a. Phaseb. Frequencyc. imed. !mplitude

". #ommunication systems are most often categori$ed by what characteristic?

a. %odulation frequencyb. #arrier frequencyc. ransmission distanced. &nformation transmitted

' (oltage gain in decibels is

a. 1) ln

b. 1) log

c. ") ln

d. ") log

* Which expression indicates a measurement using a 1-W reference

a. d+m,1b. d+1c. d+Wd. d+,W

!n amplifier operating over a "-%h$ bandwidth has a / input resistance. &f it is operating at ""0 # andhas a voltage gain of ')) the noise produced at the output of this amplifier would be approximately

a.

b.

c.

d.

2 Which of the following is not an example of external noise

a. Fluorescent lightb. 3olar emissionc. 4esistor noised. 5ightning

/ !n amplifier6s output signal has " m( p-p of desired signal mixed in with * ( rms of undesired noise. he load impedance is ) .What is the amplifier6s output 378 level in d+?

a. "".9 d+b. *.9 d+c. *.9 d+d. 1.9 d+

: Why does a -;


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b. Fourier analysisc. FFd. 1) the resonant frequency is the same as it would be if it were a series.

c. &t is commonly referred to as a tan; circuit.d. !t the resonant frequency the circuit draws minimum current from the constant-voltage source.

1" he oscillator design that uses a third capacitor in the tan; circuit for swamping out the effect of thetransistor6s internal capacitances is the

a.


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. ne full revolution of a phasor generates which percentage of a full sinewave?

a. "Ab. )Ac. 1))Ad. "))A

2. !n !% waveform at maximum is 1)) ( p-p and at minimum is *) ( p-p. he modulation percentage is

a. ")Ab. *)Ac. "Ad. '/.A

/. ! transmitter having a 9))-W carrier transmits 11:: W when modulated with a single sinewave. &f the carrier is simultaneouslymodulated with another sinewave at 2)A modulation calculate the total transmitted power.

a. 1):* Wb. 11/) Wc. 1') Wd. 1""* W

:. 5ow-level modulation is

a. he most economic approach for low-power transmitters.b. #haracteri$ed by the use of ClinearC power amplifiers to amplify the !% signal.

c. #haracteri$ed by having the carrier and the intelligence signals mix at low power levelsd. !ll the above.

9. he main advantage of a high-level modulation system compared to a low-level system is that it

a. !llows more efficient amplification.b. !llows use of low-powered intelligence signal.c. Provides higher modulation percentage.d. &s more economical.

1). What is the purpose of a buffer amplifier stage in a transmitter?

a. &t prevents transmitters from producing spurious frequencies in the output signals.b. &t provides power amplification with high efficiency.c. &ts high input impedance prevents oscillators from drifting off frequency.d. &t amplifies audio frequencies before modulation occurs.

11. he purpose of an antenna coupler is to

a. %atch the output impedance of the transmitter with the antenna6s impedance to provide maximumpower transfer.

b. !llow the transmitter to be connected to several antennas at the same time.c. Filter out the carrier frequency from the transmitter6s !% output signal.d. #ause the transmitter to operate at more than one carrier frequency at the same time.

1". he main reason for using a dummy antenna is to

a. Prevent damage to output circuits.b. %inimi$e damage to the regular antenna.c. Prevent overmodulation.d. Prevent undesired transmissions.

1'. ! spectrum analy$er is

a. !n instrument that displays amplitude versus frequency on a #4.b. ften used to determine if a transmitter6s output signal is free from any spurious signals.c. #an be thought of as a radio receiver with broad frequency range.d. !ll the above.

1*.he strategy for repair of electronic equipment includes the following.

a. (erify that a problem exists.b. &solate the defective stage.c. &solate the defective component.d. 4eplace the defective component and hot chec;.e. !ll the above.

1. ! technique that helps you understand how a carrier and sideband combine to form the !% waveformis

a. he tangential method.b. Phasor representation.c. Deying.


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d. 8one of the above.

Chapter 3: Amplitude Modulation: Reception

1. he main problem with the 4F design is

a. 5ac; of selectivity in receiving all !% stationsb. Poor demodulation of an !% stationc. Frustration in tuning to receive more than one station

d. 5ac; of sensitivity in receiving all !% stations

". he sensitivity of a receiver has to do with its ability to

a. Withstand shoc;b. 4eceive one station versus anotherc. 4eceive wea; stationsd. !ll the above

'. When the input to an ideal nonlinear device is an !% waveform consisting of a carrier and itssidebands the output of nonlinear mixing produces the original intelligence because

a. he intelligence signal is one of its inputs.b. ! dc component is also produced.c. he difference between the carrier and its sidebands is the original intelligence frequency.d. he intelligence frequencies are the upper and the lower sideband frequencies.

*. !n !% signal having a carrier frequency of 9*) ;


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11. he decibel difference between the largest tolerable receiver input signal and its sensitivity is called

a. he decibel power gain of the receiverb. !utomatic gain control ,!#c. he dynamic range of the receiverd. he &F amplifier gain

1". he simplest !% detector is the

a. 3ynchronous detectorb. Product detectorc.


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d. an; circuit

/. !nother term for ripple amplitude for a ceramic filter is

a. he shape factorb. he pea;-to-valley ratioc. he insertion lossd. he quality factor

:. Which of the following is not an advantage of the phase method over the filter method in producing 33+?

a. he design of the 9)H phase-shift networ; for the intelligence frequencies is simple.b. 5ower intelligence frequencies can be economically used because a high-= filter is not necessary.c. &ntermediate balanced modulators are not necessary because high-= filters are not needed.d. &t is easier to switch from one sideband to the other.

9. nce an 33+ signal has been generated it must be amplified by

a. ! nonlinear amplifier to conserve bandwidthb. ! nonlinear amplifier to conserve energyc. ! linear amplifier to conserve bandwidthd. ! linear amplifier to avoid distortion

1). he advantages provided by carrier elimination in 33+ do not apply to transmission of

a. #odeb. %usic

c. 8oised. !ll the above

11. Provide the approximate Coutside-of-passbandC attenuation of a +utterworth filter.

a. '-d+ slope per octaveb. '-d+ slope per decadec. 2-d+ slope per octaved. 2-d+ slope per decade

1". !n 33+ receiver recreates the original intelligence signal by

a. %ixing the I3+ with 53+ signals and filtering out the resulting different frequenciesb. Filtering out the difference between either sideband and the internally generated carrier signalc. Filtering out the harmonics of the received sideband signal frequenciesd. !mplifying the dc term produced by mixing action

1'. #ommon types of balanced modulators include

a. 4ing modulatorb. Phase modulatorc. 5attice modulatord. !ll the above

1*. Eescribe the oscilloscope waveform of an 33+ transmitter6s balanced modulator if it exhibits carrierlea;through.

a. rape$oidal waveb. 3inewavec. F% waved. !% wave

1. he two-tone test is used to

a. est carrier suppressionb. est filter ripplec. est amplifier linearityd. 8one of the above

Chapter ": #re$uency Modulation Transmission

1 !ngle modulation includes the following types of modulationJ

a. F%b. P%c. !%

d. !ll the abovee. a and b

" he amount of frequency increase and decrease around thecenter frequency in an F% signal is called the


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a. &ndex of modulationb. Frequency deviationc. Phase deviationd. +andwidth of the F% signal

' he amount of frequency deviation is dependent on theintelligence frequency in

a. !n F% signalb. ! P% signalc. +oth F% and P% signalsd. 8either F% nor P% signals

* !n F% signal has an intelligence frequency of " ;


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1" he circuitry used to increase the operating frequency of atransmitter up to a specified value is called the

a. %ultiplierb. Gxpanderc. Pump chaind. !ll the above

1' he purpose of the matrix networ; in a stereo F% broadcast

transmitter is to

a. %ix the ':-;


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c.

d.

*he use of dual-gate %3FGs in 4F amplifier stages

a. ffers increased dynamic range over those of LFGs

b. Produces higher-frequency responses than do LFGs

c. Produces higher values of voltage gain than do LFGs

d. &s not compatible with !#

he Foster-3eely detector design is superior to the ratio detectorin that it

a. Eoes not respond to any undesired amplitude variations

b. !lso provides an output !# signal

c. ffers superior linear response to wideband F% deviations

d. Eoes not need a limiter stage

25ocal oscillator reradiation refers to radiation through the

a. 4eceiver6s wiring

b. &F transformer

c. !ntenna

d. !ll the above

/Which is not one of the three stages in which a P55 can beoperated?

a. Free-running

b. #apture

c. 5oc;ed7trac;ing

d. 3earching

:

! P55 is set up so that its (# free-runs at :.9 %h$. he (#does not change frequency unless its input is within / ;


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b. !ttenuation

c. #omplexity

d. !ll the above

1)&n an F% stereo receiver what is the purpose of the "'B'-;


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b.

c. 1 m( rmsd. 1)) m( rms

Chapter & Communication Techni$ue

1 Why are image frequencies somewhat less of a problemin F% receivers than they are in 33+ or !% receivers?

a. 33+ uses less bandwidth than does F%.

b. F% signals have a capture effect characteristic.

c. F% mixer stages are square-law devices.

d. F% receivers do not use the superheterodyne design.

" he tuned circuits prior to the mixer in a superheterodynereceiver are called the

a. Front end

b. uner

c. Preselector

d. !ll the above

' he signal-strength meter that shows the relative signal-strength level is called the MMMMMMMM .

a. 3 meter

b. 3ignal meter

c. 3trength meter

d. !ll the above

* !n !% broadcast receiver has two identical tuned circuits

with a = of ) prior to the &F stage. he &F frequency is*2) ;


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: ! receiver has a ')-d+ noise figure a 1. %h$ bandwidtha 2-d+m third intercept point and a '-d+ signal-to-noiseratio. &ts sensitivity is

a. B9* d+

b. B:"." d+

c. B/9." d+

d. B:1 d+

9 wo-modulus dividers are used in the synthesis offrequencies into the (


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b. 4egeneration

c. Eigital signal processing

d. !ll the above

" &n a 37< circuit the time that it must hold the sampledvoltage is

a. !perture time

b. !cquisition time

c. Flat-top timed. Emin

' Grror signals associated with the sampling process arecalled

a. Foldover distortion

b. !liasing

c. 8yquist rate

d. a and b

* Which of the following is not a common 4N code?

a. 4N-unipolar

b. 4N-bipolar

c. 4N-%

d. 4N-!%&

&n an asynchronous data system

a. +oth sender and receiver are exactly synchroni$ed tothe same cloc; frequency.

b. Gach computer word is preceded by a start bit andfollowed by a stop bit to frame the word.

c. he receiver derives its cloc; signal from the receiveddata stream.

d. !ll the above.

2 ! #E audio laser-dis; system has a frequency bandwidth

of ")


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1) he quanti$ing error of P#% systems for wea; signals canbe made less significant by

a. #ompanding

b. Ising time-division multiplexing

c. Ising frequency-division multiplexing

d. Filtering out the alias frequency

11 When the message and the +## are transmitted asseparate parts within the same transmitted code it iscalled a,n

a. 3ystematic code

b. #4#

c. ,n; cyclic code

d. &nterleaved code

1" he value left in the #4# dividing circuit after all datahave been shifted in is the

a. =uantile interval

b. #odec

c. +##

d. 3yndrome

1' Which of the following is not an example of code errordetection and correction in a data communicationchannel?

a. Parity

b. Frequency-shift ;eying

c. +loc;-chec; character

d.


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data rates in limited-bandwidth channels is called

a. Eelta modulation

b. Pulse-coded modulation ,P#%

c. =uadrature amplitude modulation ,=!%

d. Pulse amplitude modulation ,P!%

* F3D systems are much superior to two-tone amplitude-modulation systems with respect to

a. 8oise performance

b. +andwidth requirements of the channel

c. &onospheric fading characteristics

d. Power consumption

Which is not a type of pulse modulation?

a. Pulse-amplitude modulation ,P!%

b. Pulse-width modulation ,PW%

c. Pulse-frequency modulation ,PF%

d. Pulse-position modulation ,PP%

2 PP% and PW% are superior to P!% systems in

a. 8oise characteristics

b. +andwidth characteristics

c. 3implicity in design

d. Frequency response of the intelligence signal

/


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a. Gxcessive noise producing errors

b. 3lope overload

c. &nsufficient frequency response of the intelligence signal

d. #omplexity of design

1' he capacity of a telephone channel that has an 378 of")*/ if its bandwidth is '. ;


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a. ! cellular telephone system

b. ! telephone system that uses frequency reuse

c. ! cell-splitting telephone system

d. !ll the above

Which is not a ma@or function of a protocol?

a. Framing

b. 5ine control

c. Flow controld. opology

e. 3equence control

2 he 5!8 that was developed by erox Eigital Gquipment#orporation and &ntel in 19:) is called

a. &GGG-*::

b. Gthernet

c. 3&

d. #3%!7#E

/ ! device interconnecting two networ;s that use differentprotocols and formats is called a

a. +ridge

b. ateway

c. 4outer

d. 8ode

: ! device interconnecting 5!8s together that usually haveidentical protocols at the physical and data lin; layers iscalled a

a. +ridge

b. ateway

c. 4outer

d. 8ode

9 &n telephony traffic is defined in

a.


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a. 3tar

b. 4ing

c. +us

d.a and b

1* he following numeric describing data rates for coppercoax and twisted pair is rarely used

a. 1) +ase "

b. 1) +ase

c. 1) +ase d. 1)) +ase F

e. a and b

1 he xE35 service with the highest pro@ected data rate is

a. (E35

b. 3E35

c.


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/ ! flat line indicates

a. 8o reflection

b. (3W4 Q 1

c. 8o physical imperfections

d. a and b

: ! nonlossy transmission line terminated with a short circuit

has an

a. &n-phase reflected voltage that is equal in magnitude tothe incident voltage

b. pposite-phase reflected voltage that is equal inmagnitude to the incident voltage

c. &n-phase reflected voltage that is smaller in magnitudethan the incident voltage

d. pposite-phase reflected voltage that is smaller inmagnitude than the incident voltage

9 ! manufacturer6s specification dealing with crosstal; andattenuation is

a. !#4

b. #!3c. #!!

d. !!#

1) ! )- transmission line that has a load impedance of

')) has a (3W4 of

a. 2J1

b. 1J2

c. ).222J1

d. 1.J1

11 he input impedance of a quarter-wavelength section of a

)- transmission line that is terminated with a short is

a. )

b. ) ,a short

c. &nfinite ,open

d. 1))

1" ! device that is used to match an unbalancedtransmission line to a balanced transmission line is calleda

a. =uarter-wavelength matching transformer

b. +alun

c. 3horted-stub section

d. 3lotted line

1' ! )- transmission line with a '))- load impedance

has a reflection coefficient of

a. 2

b. ).122

c. )./1*

d. 1.*

1* ! cable has an inductance of 1 n


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c.

d.

1 ! transmission line can be used as a,n

a. &nductor

b. #apacitor

c. Filter

d. %atching sectione. !ll the above

Chapter 12 /a0e ropagation

1 !n antenna can be thought of as a,n

a. scillator

b. #apacitor

c. ransducer

d. Frequency multiplexer

" ! wave that is characteri$ed by having its direction of

propagation perpendicular to its oscillation is ;nown as

a. &sotropic

b. ransverse

c. Polari$ed

d. 4efractive

' Which is not an effect of our environment on wavepropagation?

a. 4adiation

b. 4eflection

c. 4efraction

d. Eiffraction

* ! point in space that radiates electromagnetic energyequally in all directions is called

a. ransverse

b. &sotropic point source

c. mnisphere

d. 3hadow $one

he process of waves which traveling in straight pathsbending around an obstacle is

a. 4adiation

b. 4eflection

c. 4efraction

d. Eiffraction

2 Which is not one of the basic modes of getting a radiowave from the transmitting to receiving antenna?

a. round wave

b. 3hadow wave

c. 3pace wave

d. 3atellite lin;

e. 3;y wave

/ he type of wave that is most affected by the E G and Flayers of the ionosphere isJ

a. round waveb. 3pace wave

c. 3;y wave

d. 3atellite


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: he largest frequency that will be returned to earth whentransmitted vertically under given ionospheric conditions iscalled the

a. #ritical frequency

b. %aximum usable frequency ,%IF

c. ptimum wor;ing frequency ,WF

d. 3;ip $one

9 he characteristic impedance of free space is

a. 8ot ;nown

b. &nfinite

c. )

d. '//

1) he area between the point where the ground wave endsand first s;y wave returns is called the

a. =uiet $one

b. 3;ip $one

c. 8ull None

d. !ll the abovee. a and b

11 he refraction and reflection action of a s;ywave betweenthe ionosphere and ground is ;nown as

a. 3pace diversity

b. 3;ip

c. ropospheric scattering

d. Fading

1" ! satellite communication system used by companiessuch as D-%art to quic;ly verify credit cards and chec;inventory data is called

a. (3!b. %3!

c. 3!#%

d. WG3!4

1' ! common type of radio wave interference is

a. G%&

b. Fading

c. 4eflections

d. !ll the above

1* Eiversity reception does not includeJ

a. 3pace diversityb. ime diversity

c. Frequency diversity

d. !ngle diversity

1 When installing a receiving antenna you can oftenovercome diffraction problems by finding a

a. 8ull $one

b. Eownlin;

c.


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a. Polari$ation

b. 4eciprocity

c. Gfficiency

d. #ounterpoise

" ! half-wave dipole antenna is also ;nown as

a. %arconi antenna

b.


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a. une out the capacitive reactance portion of the inputimpedance of the antenna

b. une out the inductive reactance portion of the inputimpedance of the antenna

c. 4aise the input impedance of the antenna

d. Eecrease the losses of the antenna

1) 3tandard !% broadcast stations usually use what type oftransmitting antennas?

a. Eriven collinear array

b. %arconi array

c. Ragi-Ida

d. 5og-periodic

11 he type of antenna often found in small !% broadcastreceivers is a

a. Ferrite loop antenna

b. Folded dipole antenna

c. 3lot antenna

d. 5og-periodic antenna

1" he folded dipole antenna has

a. reater bandwidth than a half-wave dipole

b. ! "::- input impedance

c. 5ess bandwidth than a half-wave dipole

d.. a and b

e. b and c

1' he Ragi-Ida antenna consists of

a. ! driven director and parasitic reflector

b. ! driven reflector and parasitic director

c. ! parasitic director and reflector

d. !ll the above

1* ! grid-dip meter measures the resonant frequency oftuned circuits

a. +y connection in series with the inductance

b. +y connection in parallel with the inductance

c. Without power being applied to the tuned circuit

d. +y connection in series with the capacitance

1 When troubleshooting antennas the level of (3W4 thatindicates a problem is

a. reater than 1

b. 5ess than 1

c. reater than 1.

d. 5ess than ).

Chapter 14 /a0eguides RA(AR

1 !t a frequency of 1 h$ and transmitter-receiver distanceof ') mi which is the most efficient device for energytransfer?

a. ransmission lines

b. Waveguides

c. !ntennas

d. 8one of the above

" he most efficient means of transmitting a 1-h$ signal1)) ft would typically be


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a. ransmission lines

b. Waveguides

c. !ntennas

d. 8one of the above

' he dominant mode for waveguide operation is

a. G1)

b. G)1

c. %1)

d. %)1

* he propagation velocity of the signal in a waveguidewhen compared to the speed of light is

a. larger

b. smaller

c. the same velocity

d. either b or c

4idged waveguides are advantageous over rectangularwaveguides in their

a. cost

b. attenuation

c. ability to wor; at lower frequency

d. ease of construction

2 ! circular waveguide is used for

a. Gfficiency reasons

b. Gase of manufacture

c. 4otating section applications

d. reater bandwidth

/ (ariable attenuators are used in waveguides to

a. &solate a source from reflections at its load so as topreclude frequency pulling.

b. !d@ust the signal levels.c. %easure signal levels.

d. !ll the above.

: he coupling in d+ of a directional coupler that has :mW into the main guide and ).* mW out the secondaryguide is

a. "".:

b. 1:.9

c. 1::.9

d. *.2

9 he resonant frequency of a cavity may be varied by

changing the cavity6s

a. (olume

b. &nductance

c. #apacitance

d. !ll the above

1) he guide wavelength is

a. reater than free-space wavelength

b. Gqual to free-space wavelength

c. 5ess than free-space wavelength

d. !ll the above

11 he process of employing radio waves to detect andlocate physical ob@ects is ;nown as

a. he Eoppler effect

b. 4adar


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c. Eirectional coupling

d. #avity tuning

1" he use of two grounded conductors that sandwich asmaller conductive strip with constant separation by adielectric material on a printed circuit board for use atfrequencies above )) %h$ is ;nown as

a. !rtwor; traces

b. Eielectric waveguide

c. %icrostrip7stripline

d. %s or %%s

1' 3econd return echoes are

a. Gchoes produced when the reflected beam ma;es asecond trip

b. Gchoes that arrive after the transmission of the nextpulse

c. Gchoes caused by the P4 being too long

d. !ll the above

1* he characteristic wave impedance for waveguides is

a. /

b. '//

c. Eependent on frequency

d. Eependent on waveguide shape

e. c and d

1 ! dielectric waveguide is

a. Gnclosed by a conducting material

b. ! waveguide with @ust a dielectric

c. Eependent on the principle that two dissimilardielectrics can guide waves

d. b and c

Chapter 1" Micro,a0es asers

1 Which is not a type of horn antenna design for microwavefrequencies?

a. Parabolic hornb. #ircular hornc. Pyramidal hornd. 3ectoral horn

" #assegrain feed to a paraboloid antenna involves a

a. Eipole antenna

b. Point-source antennac. 3econdary reflectord. !ny of the above

' #alculate the beamwidth of a microwave dish antenna with a 2-mmouth diameter when used at h$.

a. ).*90b. *.90c. /0d. )./0

* Noning refers to

a. ! method of producing a radomeb. #hanging a spherical wavefront into a plane wave

c. #reating a polar radiation patternd. Fading into nonreality

Which microwave oscillator has high gain low-noisecharacteristics and wide bandwidth?


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a. raveling wave tube oscillatorb. unn scillatorc.Dlystron oscillatord. %agnetron oscillator

2 Which is not an advantage of the unn gallium arsenideoscillator?

a. Gase of removing heat from the chipb. 3mall si$ec. 4uggednessd. 5ac; of filamentse. 5ow cost of manufacture

/ he i in P-&-8 diode refers to

a. &ndiumb. &mpactc. &ntegratedd. &ntrinsic

: Which is not a typical application of a ferrite in a microwavesystem?

a. attenuatorb. amplifierc. isolatord. circulator

9 ! low noise microwave amplifier that provides amplification viathe variation of a reactance is ;nown as a

a. %aserb. 5aserc. Rigd. Parametric amplifier

1) he ma@or difference between a laser and a maser is the

a. Frequency of the signal being amplified

b. !mplitude of the signal being amplifiedc. +andwidth of the signal being amplifiedd. Phase of the signal being amplified

11 5asers are useful in

a. &ndustrial weldingb. 3urgical proceduresc. Eistance measuringd. #ompact disc playerse. !ll the above

1" he following semiconductor is not used as a microwave deviceJ

a. P&8 diodeb. +aritt diode

c. Nener dioded. unnel diode

1' Which of the following represent typical failure mode,s for a Wamplifier?

a. 5ow gainb. 3purious modulationc. Poor frequency responsed. 5ow 4F outpute. !ll the above

1* Which of the following is not used as a microwave antenna?

a. Patch antennab. %arconi antenna

c. 5ens antennad.


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b. %ore efficientc. 3implerd.


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a. 4etention

b. Flic;er

c. Persistence

d. +ac; porch

/Which is not part of the tuner section of a ( receiver?

a. he rf amplifier stage

b. he mixer stage

c. he local oscillator stage

d. he video-detector stage

:he stage in a ( receiver that filters out the vertical andhori$ontal retrace pulses from the video signal is the

a. (ideo detector

b. (ideo &F amplifier

c. 3ync separator

d. 3ound detector

9he winding around the #4 yo;e that deflects the electron beamwith its magnetic field is called the

a. #oil

b. Ro;e

c. Eeflector

d. %agneto

1)! cumbersome series of ad@ustments to a color ( receiver inorder to ma;e sure that the three electron beams of the picturetube are positioned exactly on their respective color dots on theface of the picture tube is called

a. !lignment

b. #onvergence

c. &nterleaving

d. &nterlacing

11! faulty ( receiver having symptoms of normal sound and rasterbut no picture must have a problem in the

a.


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a. #4 illumination by scan lines when no signal is beingreceived

b. #4 resolution

c. #4 aspect ratio

d. !ll the above

1'he high voltage for the anode of the #4 is obtained from thelow-voltage power supply using

a. &ts power-line transformer

b. he yo;e coil

c. he vertical oscillator

d. he flybac; transformer

1*he introduction of digital television in the Inited 3tates has beenhampered by

a. Eelays in chip designs

b. 3hortages of appropriate chips

c. #ustomer re@ection

d. 5ess than ideal regulatory climate

1When a digital picture free$es even when there is motion in thevideo it is

a. due to bandwidth problems

b. #alled a pixelate

c. Eue to noise

d. b and c

Chapter 1& #i!er ptics

1Which is an advantage of optical communication lin;s over usingtransmission lines or waveguides?

a. 3mall si$e

b. Gxtremely wide bandwidths

c. &mmunity to electromagnetic interference ,G%&

d. 5ower cost

e. !ll the above

"he most common light used in fiber-optic lin;s is

a. &nfra-red

b. 4ed

c. (iolet


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d. Iltraviolet

'he optical band designation,s include

a. 3

b. #

c. 5

d. a and b above

e. !ll the above

*&n the telecommunications industry the most commonly usedfiber,s are

a. ) micron

b. 2". micron

c. ) and 2". micron

d. 1" micron

he abrupt change in refractive index from core to cladding offiber-optic cable is called the

a. otal internal reflection

b. 8umerical aperture

c. Eispersion

d. 3tep index

2! technique that is used to minimi$e the pulse dispersion effect isto

a. Ise a higher frequency light source

b. Ise plastic cladding

c. %inimi$e the core diameter

d. !ll the above

/

he loss ,attenuation of signal in optical fiber is due to

a. 3cattering

b. !bsorption

c. %acrobending

d. %icrobending

e. !ll the above

:#alculate the optical power 1)) ;m from a ). mW source on asingle mode fiber that has ).1) d+ per ;m loss.

a. ) nW

b. )) nW


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c. uW

d. ) uW

9Which is not an important characteristic of a light detector?

a. 4esponsitivity

b. Ear; current

c. Power consumption

d. 4esponse speed

e. 3pectral respons

1)he dispersion in fiber optics is termed

a. %odal

b. #hromatic

c. Polari$ation mode

d. !ll the above

e. a and b above

11Fiber optic connections suffer high loss due to

a. !ir gaps

b. 4ough surfaces

c. !xial misalignment

d. !ngular misalignment

e. !ll the above

1"Fiber optic technology is used in applications of

a. 5ocal area networ;s ,5!8s

b. #able ( ,#!( systems

c. elephone networ;s

d. !ll the above

1'he dispersion of light in fiber-optic cable caused by a portion ofthe light energy traveling in the cladding is called

a. %odal dispersion

b. %aterial dispersion

c. Waveguide dispersion

d. #able dispersion

1*4ecent laser developments for fiber optic communication include

a. Eistributed feedbac; ,EF+


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b.


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Documents

Miller (Modern Electronics Communications